// 打印类属性、方法定义
const Print = function (dom, options) {
    if (!(this instanceof Print)) return new Print(dom, options)

    this.options = this.extend(
        {
            noPrint: '.no-print',
        },
        options,
    )

    if (typeof dom === 'string') {
        try {
            this.dom = document.querySelector(dom)
        } catch {
            const createDom = document.createElement('div')
            createDom.innerHTML = dom
            this.dom = createDom
        }
    } else {
        this.isDOM(dom)
        this.dom = this.isDOM(dom) ? dom : dom.$el
    }

    this.init()
}
Print.prototype = {
    init: function () {
        const content = this.getStyle() + this.getHtml()
        this.writeIframe(content)
    },
    extend: function (obj, obj2) {
        for (const k in obj2) {
            obj[k] = obj2[k]
        }
        return obj
    },

    getStyle: function () {
        let str = '',
            styles = document.querySelectorAll('style,link')
        for (let i = 0; i < styles.length; i++) {
            str += styles[i].outerHTML
        }
        str += '<style>' + (this.options.noPrint ? this.options.noPrint : '.no-print') + '{display:none;}</style>'
        str += '<style>html,body{background-color:white;}</style>'
        return str
    },

    getHtml: function () {
        const inputs = document.querySelectorAll('input')
        const textareas = document.querySelectorAll('textarea')
        const selects = document.querySelectorAll('select')

        for (let k = 0; k < inputs.length; k++) {
            if (inputs[k].type === 'checkbox' || inputs[k].type === 'radio') {
                if (inputs[k].checked === true) {
                    inputs[k].setAttribute('checked', 'checked')
                } else {
                    inputs[k].removeAttribute('checked')
                }
            } else if (inputs[k].type === 'text') {
                inputs[k].setAttribute('value', inputs[k].value)
            } else {
                inputs[k].setAttribute('value', inputs[k].value)
            }
        }

        for (let k2 = 0; k2 < textareas.length; k2++) {
            if (textareas[k2].type === 'textarea') {
                textareas[k2].innerHTML = textareas[k2].value
            }
        }

        for (let k3 = 0; k3 < selects.length; k3++) {
            if (selects[k3].type === 'select-one') {
                const child = selects[k3].children
                for (const i in child) {
                    if (child[i].tagName === 'OPTION') {
                        if (child[i].selected === true) {
                            child[i].setAttribute('selected', 'selected')
                        } else {
                            child[i].removeAttribute('selected')
                        }
                    }
                }
            }
        }

        return this.dom.outerHTML
    },

    writeIframe: function (content) {
        let w,
            doc,
            iframe = document.createElement('iframe'),
            f = document.body.appendChild(iframe)
        iframe.id = 'myIframe'
        //iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
        iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;')
        w = f.contentWindow || f.contentDocument
        doc = f.contentDocument || f.contentWindow.document
        doc.open()
        doc.write(content)
        doc.close()
        const _this = this
        iframe.onload = function () {
            _this.toPrint(w)
            setTimeout(function () {
                document.body.removeChild(iframe)
            }, 100)
        }
    },

    toPrint: function (frameWindow) {
        try {
            setTimeout(function () {
                frameWindow.focus()
                try {
                    if (!frameWindow.document.execCommand('print', false, null)) {
                        frameWindow.print()
                    }
                } catch (e) {
                    frameWindow.print()
                }
                frameWindow.close()
            }, 10)
        } catch (err) {
            console.log('err', err)
        }
    },
    isDOM:
        typeof HTMLElement === 'object'
            ? function (obj) {
                  return obj instanceof HTMLElement
              }
            : function (obj) {
                  return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string'
              },
}

export default Print